Eric V. Smith <e...@trueblade.com> added the comment:

It's true that f-string expressions can't contain newlines.

f-strings are definitely easier, because the tokenizer has already tokenized 
the string from the input, so I'm just remembering pointers inside the 
tokenized string.

I was thinking that maybe you could get access to the buffer that the tokenizer 
is using. I'd have to check to see if it's guaranteed to all be in one 
contiguous buffer or not.

Anyway, since the problem is at least superficially similar (at least to me!), 
I thought I'd mention how f-strings handle it. There might not be anything of 
value here to take away.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41967>
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